8 increases to 1000 N. Find the speed at which the train leaves the tunnel.the train enters a horizontal tunnel 400 m long. In the tunnel air resistanceng at 48 msM 6A submarine has mass 20 000 tonnes. With the engines on full power it can travel at 11ms on the surface and14 ms underwater.aWhen at maximum speed on the surface, the engines are turned off and it takes 4 km to come to a stop.Find the resistance from the water on the submarine.bAssuming the same resistance from the water, find the distance it would take to stop from maximumspeed underwater when the engines are turned off.cWhy is it not a reasonable assumption that the resistance underwater is the same as the resistance whenthe submarine is at the surface?4.0 borpsjong7A diver of mass 60 kg dives from a height of 10 m into a swimming pool. Through the air there is resistance of50 N.a Find the speed at which the diver enters the water.bOnce in the water, the water provides an upwards force of 2000 N. Find the greatest depth in the water thediver reaches.8A car of mass 400 kg is approaching a junction and needs to stop in 40 m. It is travelling at 15 ms¹ and there is airresistance of 1200 N. Determine whether the car needs to brake or accelerate and find the size of the relevant force.9A ball of mass 0.1kg is projected vertically upwards from ground level with speed 9 ms ¹. It reaches a height of3 m. There is air resistance against the motion.aFind the size of the air resistance.bFind the speed with which the ball hits the ground.

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8 A car of mass 400 kg is approaching a junction and needs to stop in 40 m. It is travelling at 15 ms-¹ and there is air resistance of 1200 N. Determine whether the car needs to brake or accelerate and find the size of the relevant force. 0.1kg is proiected vertically unwards from ground level with spe do.

8 A car of mass 400 kg is approaching a junction and needs to stop in 40 m. It is travelling at 15 ms-¹ and there is air resistance of 1200 N. Determine whether the car needs to brake or accelerate and find the size of the relevant force. 0.1kg is proiected vertically unwards from ground level with spe do.

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter7: Work And Kinetic Energy

Section: Chapter Questions

Problem 67P: A person in good physical condition can put out 100 W of useful power for several hours at a...

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